Apparently someone has leaked the specifications of the Samsung Galaxy S9 Active online as follows:
Display 5.8 inch SUPER AMOLED 2960 x 1440 pixels
Processor Qualcomm SnapDragon 845 Octa Core
12 MP camera f1.5/f2.4 dual aperture
8MP front camera f1.7
4000 mAh Battery
Launch Q3 2018.